From Sega Retro
Genesis Plus is a Sega Mega Drive emulator written by Charles MacDonald. The emulator emulates all sound channels, and has support for six button Genesis game pads, and support for both BIN and SMD format ROM images.
Genesis Plus focuses on a high level of accuracy in its emulation over the addition of features. As a result, Genesis Plus is one of the most accurate Sega Genesis emulators available, as it maintains a level of accuracy even to a point where problems exhibited on the original hardware will be exhibited in the emulator as well. The only other Sega Genesis emulator that has such a level of emulation accuracy is Kega Fusion.
The Sega Dreamcast port was the first Sega Genesis emulator on the Dreamcast to achieve nearly full speed emulation with proper sound, surpassing even Sega's own emulator in Sega Smash Pack Vol. 1. To this date, it is still the only Sega Genesis emulator on the Dreamcast to hold that distinction.